Archive

Posts Tagged ‘industrial technology’

A problematic HSC ITG Question (2001 Q5a)

March 11, 2009 Leave a comment

I discovered this back in 2007 when I was preparing for my HSC exams.

Here is the question (from the exam paper here),

2001 HSC ITG Q5a

2001 HSC ITG Q5a

Firstly I think this question is beyond the scope of the syllabus. The only relevant dot point says,

“Pictorial drawing

  • isometric
  • perspective (mechanical and measuring point)”

There is no reference to oblique drawing or oblique projection (this was the official answer).

Secondly, and more importantly the examiners say in their Notes from the Marking Centre, “This part was generally well answered; candidates had little trouble in identifying oblique and perspective projection.”

They claim that the first one is oblique projection, yet with just the information given its impossible to determine the projection used. For example the drawing given could be of a cube drawn in oblique projection or it could be of another object (shown below) in isometric projection, or some other object in some other projection. There are infinity different projections that it could have been drawn in.

An object (I call a Vube) shown in 3rd angle orthogonal which when drawn in isometric looks like a cube in oblique.

An object (I call a Vube) shown in 3rd angle orthogonal which when drawn in isometric looks like a cube in oblique.

Vube shown in perspective.

Vube shown in perspective.

The exam paper should have specified that the object in question is a cube.

Advertisements

A Custom Drawing Projections Tool

November 29, 2008 10 comments

Back in 2007 I developed a software tool that could generate technical drawings in a range of drawing projections from a 3D model with emphasis on oblique (both cabinet and cavalier, as well as custom obliques), planometric, dimetric, trimetric and one-point perspective.

I could describe them all as well as many more in terms of what the projected three axis look like on the projection plane. I described them all in terms of a scale on each of the three axis, as well as the angle two of the axis make with the projection plane’s horizontal.

Description of the projection in terms of the projected view of the three standard basis.

Description of the projection in terms of the projected view of the three standard basis.

In terms of the actual development of the program I’m sure I could have done things a lot better. But I did learn a lot from the experience. The program worked to my needs and did what I wrote it to do so in that sense it was a success. The only downside would be that I did a lot of code rewriting of code that already existed out there (which probably did thinks better than I implemented them). Although since then I have done much more programming and had formal training so have learnt about better methods and practices.

The approach I took was basically import a DXF file, process the data to change its projection, and then export it as a DXF again. I used 3D polylines generated from my 3D model in Rhino and saved as DXF for the input. So I had to write a cutdown DXF reader/writer, as well as a way of storing this data internally and then doing the transformations on it then exporting it back into DXF so I could open it up in AutoCAD.

I only supported points, polylines, circles and arcs as this is basically all that Rhino exported from my model. To simplify the process of circles and arcs I internally converted them to a bunch of polylines as only for some projections they stayed as nice ellipses.

The user interface of the tool.

The user interface of the tool.

From a very simple model in Rhino, I use the silhouette tool to create the polylines which once impororted into my program produced the following samples.

Cabinet Oblique

Cabinet Oblique

Cavalier Oblique

Cavalier Oblique

Planometric

Planometric

One Point Perspective

One Point Perspective

There is also a range of built in axonometric projections…

A range of axonometric projections are built in.

A range of axonometric projections are built in.

Finally here are some of my production drawings (from my 2007 HSC ITG Major Work (photos here)) that I used the software to create.

Oblique

Oblique

One Point Perspective

One Point Perspective

Planometric

Planometric

Trimetric

Trimetric

The New Industrial Technology Syllabus (HSC 2010)

October 18, 2008 Leave a comment

Only a couple of days ago the new Industrial Technology Syllabus to be implemented for the HSC in 2010 was released. It appears they finally weaved out a lot of the bugs making it much clearer and much less ambiguous. You wouldn’t think it would take them six years to do this, but turns out it did. The syllabus was not redone, rather just amended.

As for the changes… Well I guess the biggest change is the removal the Building and Construction, and Plastics Industries. I can understand the removal of Building and Construction as there is already a Construction VET course available, it’s always a shame to see a subject go so bad news for plastics enthusiasts, although it’s understandable when it gathers next to zero candidates each year.

The four sections of the course,

A. Industry study
B. Design and management
C. Workplace communication
D. Industry-specific content and production

have been changed to,

A. Industry Study
B. Design, Management and Communication
C. Production
D. Industry Related Manufacturing Technology.

They have also separated a lot of the preliminary content from the HSC content. This makes a lot of sense previously it appeared that you were supposed to learn the exact same content in both years. Also they have listed “Students learn about” and “Students learn to” dot points for the Major Work.

The most interesting (to me at least) changes were to that of the Graphics Industries specific content (note that they are now called technologies (collectively as focus areas) rather than industries e.g. you would now say the focus area Graphics Technologies). I support many, if not all of these changes although you get the feeling that this is what the original syllabus writers meant to be in the syllabus but simply forgot about and only now noticed that it was missing. I say this because much of the content from the previous HSC exams was based on material and content that was absent from the syllabus but has now been placed in the 2010 one. The order and categorising of this material has been redone and is much cleaner and nicer now.

For instance we now have oblique drawings (with references to cabinet and cavalier) mentioned in the syllabus along with,

  • A mention of architectural drawings including plans, elevations, sections, footing details, plumbing, electrical and roofing details, council requirements, site plans, set backs, shadow diagrams, landscape plans and colour palette and material selection. Previously they just said we need to know architectural styles and details without any elaboration.
  • axonometric projection
  • presentation techniques now include ‘fly-thoughs’ and prototypes
  • and equipment includes, both computer software packages AND mechanical drafting equipment rather than just either, scanners, electronic storage mediums such as external hard drives and flash drives (although they could have mentioned the common practice of storing files centrally on a file server in one place for many people to access, which is the much more common practice in the workplace), display folders, appropriate sized paper and stationary.

The Multimedia Technologies section also is much better now. It now contains the study of different types of fonts, formatting features, page layout elements for publications, features of graphics such as file formats and resolution, methods of obtaining images, image manipulation and editing, audio features such as sampling rate, file formats, analogue vs. digital, video features like frame rate compression, editing, compositing, animation techniques both 2D and 3D with references to motion capture, virtual reality, along with the world wide web, intellectual property, and the list goes on and on… Don’t just go by my description here go read the syllabus document, you will be very pleased with the changes or should I say additions.

If I were doing my HSC again, I know for sure I would have a very hard time choosing between multimedia and graphics technologies. They used to be together as one industry back pre 1999, although I must admit it is too much for someone who has done neither before to master both as one 2U subject. I wish you could do both, but they can’t allow that because the industry study, design and communication parts would be too common.

As for the common sections (Industry Study, Design and Management and Communication) the improvements here were good too with much more detail. But it’s not just the fact that the document is more detailed, but these details are what you would expect. They are in the right direction and are things that should be included. The Design section reinforces that the major project is not just about production of something, but the design aspects that go into it. The only problem I currently have is where is this design meant to be applied. It should be in the most obvious place, but the way the syllabus refers to production makes this slightly unclear. Timber Products and Furniture Technologies would look at the design aspects of the timber products or furniture product that they were producing. But if you were doing Graphics Technologies, your product is a series of drawings and perhaps related media such as flythoughs, etc. Do you look at the design of these drawings, I would say not, rather you should apply design techniques to the thing you are drawing, whether that be a product, building or a mechanical system. I don’t think this has been cleared up.

I haven’t been up to date with all things related here, so I may have missed some things. But one thing is for sure that I congratulate the Board for their work on this, and I’m sure many HSC students will benefit immensely from this revised syllabus. The syllabus is in much better shape now. As for the content, well I could argue that the material from the stage 5 graphics technology syllabus is more advanced than that of the stage 6 syllabus, and this should not happen. But as long as the stage 5 course is not a prerequisite, and as long as you have less time to cover industry specific content from the stage 6 course than that of the stage 5 course, there is little that can be done.

(PS. As a self advertisment, my 2007 HSC Industrial Technology Graphics Industries Major Work in its entirety can be downloaded from my site here, http://andrew.harvey4.googlepages.com/)